{"id":297,"date":"2019-03-29T10:58:06","date_gmt":"2019-03-29T02:58:06","guid":{"rendered":"http:\/\/cms.aaasec.com.tw\/?p=297"},"modified":"2019-03-29T11:20:01","modified_gmt":"2019-03-29T03:20:01","slug":"z3","status":"publish","type":"post","link":"https:\/\/cms.aaasec.com.tw\/index.php\/2019\/03\/29\/z3\/","title":{"rendered":"Code Injection \u7b2c\u4e09\u90e8\u66f2\u2014XML Injection"},"content":{"rendered":"<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-305\" src=\"https:\/\/cms.aaasec.com.tw\/wp-content\/uploads\/2019\/03\/3-XXE.jpg\" alt=\"\" width=\"960\" height=\"720\" \/><\/p>\n<p><!--more--><\/p>\n<p>XML\u5916\u90e8\u8655\u7406\u5668\u6f0f\u6d1e ( XML External Entity, XXE ) \uff0c\u4f60\u53ef\u80fd\u4e5f\u807d\u904e\u4ed6\u66f4\u666e\u904d\u7684\u540d\u5b57\u300cXML Injection\u300d\u3002\u800c\u9019\u9805\u6ce8\u5165\u5f0f\u653b\u64ca\u5165\u9078\u4e86\u65b0\u72482017\u5e74OWASP Top 10\u5341\u5927\u7db2\u7ad9\u5b89\u5168\u98a8\u96aa\u4e14\u4f4d\u5c45\u7b2c\u56db\uff0cXXE\u8207\u8d8a\u4f86\u8d8a\u591a\u7684\u5fae\u670d\u52d9\u8208\u8d77\u6709\u8457\u5bc6\u5207\u7684\u95dc\u4fc2\u3002\u8a31\u591a\u4ee5XML\u70ba\u57fa\u790e\u7684\u7db2\u7ad9\u670d\u52d9\uff0c\u5ffd\u7565\u4e86\u7ba1\u63a7\u6b0a\u9650\u7684\u91cd\u8981\u6027\uff0c\u80fd\u76f4\u63a5\u900f\u904eXML\u8a9e\u6cd5\u9032\u884c\u8acb\u6c42\u6216\u4e0a\u50b3\uff0c\u800c\u9020\u6210\u8655\u7406\u5668\u6f0f\u6d1e\u653b\u64ca\uff0c\u751a\u81f3\u7522\u751f\u8cc7\u6599\u5916\u6d29\u3001DoS\u7b49\u56b4\u91cd\u7684\u98a8\u96aa\u3002<\/p>\n<p>\u5728\u4e86\u89e3XXE\u4e4b\u524d\uff0c\u4f60\u9700\u8981\u5148\u77e5\u9053XML\u662f\u4ec0\u9ebc\uff1fXML\u662f\u4e00\u7a2e\u8cc7\u6599\u7684\u683c\u5f0f\uff0c\u65b9\u4fbf\u5728\u4e0d\u540c\u7684\u5e73\u53f0\u9593\u4e92\u76f8\u50b3\u905e\u3001\u5132\u5b58\u3001\u5206\u4eab\u7b49\u3002\u800cXXE\u5247\u662f\u5229\u7528XML\u7684\u4fbf\u5229\u6027\uff0c\u900f\u904e\u5916\u90e8\u5be6\u9ad4\u6ce8\u5165\u7684\u624b\u6cd5\uff0c\u8b93\u60e1\u610f\u4f7f\u7528\u8005\u80fd\u81ea\u8a02\u4e00\u500b\u5be6\u9ad4\u540d\u7a31\uff0c\u4e26\u6307\u5b9a\u8a72\u5be6\u9ad4\u91dd\u5c0d\u4f3a\u670d\u5668\u57f7\u884c\u7279\u5b9a\u7684\u6307\u4ee4\uff0c\u9032\u800c\u9020\u6210\u8cc7\u6599\u5916\u6d29\u7b49\u8cc7\u5b89\u554f\u984c\u3002\u70ba\u4e86\u8b93\u5927\u5bb6\u80fd\u66f4\u6df1\u523b\u7684\u9ad4\u609fXXE\u7684\u653b\u64ca\u624b\u6cd5\uff0c\u9019\u908a\u5c0f\u7de8\u6703\u4ee5\u653b\u64ca\u6d41\u7a0b\u4f86\u4e00\u4e00\u70ba\u5927\u5bb6\u4ecb\u7d39\u3002<\/p>\n<p>\u9996\u5148\u5c0f\u7de8\u5011\u6e96\u5099\u4e86\u4e00\u500bPHP\u64b0\u5beb\u7684\u7db2\u7ad9\uff0c\u900f\u904eGET XML\u683c\u5f0f\u4f86\u5448\u73fe\u8cc7\u6599\uff0c\u5167\u5bb9\u5982\u4e0b\u5716\u3002<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-298\" src=\"https:\/\/cms.aaasec.com.tw\/wp-content\/uploads\/2019\/03\/1-1.png\" alt=\"\" width=\"434\" height=\"101\" \/><\/p>\n<p>\u4e0b\u4e00\u6b65\u900f\u904e\u300chttp:\/\/192.168.156.8\/xml\/example1.php?xml=<span style=\"color: #ff0000;\">&lt;?xml version=&#8221;1.0&#8243; encoding=&#8221;utf-8&#8243;?&gt;&lt;root&gt;&lt;name&gt;Alice&lt;\/name&gt;&lt;year&gt;20&lt;\/year&gt;&lt;\/root&gt;<\/span>\uff0c\u4ee5$_GET[\u2018xml\u2019]\u50b3\u905e\u300c\u6b63\u5e38\u7684\u300dXML\u8cc7\u6599\u683c\u5f0f\u3002<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-299\" src=\"https:\/\/cms.aaasec.com.tw\/wp-content\/uploads\/2019\/03\/2.png\" alt=\"\" width=\"349\" height=\"98\" \/><\/p>\n<p>\u63a5\u8457\u958b\u555f\u700f\u89bd\u5668\uff0c\u53ef\u770b\u5230\u63a5\u6536XML\u683c\u5f0f\u7684\u7db2\u7ad9\uff0c\u5982\u4e0b\u5716\u3002<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-300\" src=\"https:\/\/cms.aaasec.com.tw\/wp-content\/uploads\/2019\/03\/3.png\" alt=\"\" width=\"716\" height=\"189\" \/><\/p>\n<p>\u5982\u6b64\u4e00\u4f86\uff0c\u53ef\u4ee5\u7c21\u6613\u5730\u5229\u7528XML\u6240\u5b9a\u7fa9\u597d\u7684\u8cc7\u6599\u683c\u5f0f\u4f86\u5448\u73fe\u7db2\u9801\u5167\u5bb9\u3002XML\u7684\u512a\u9ede\u5728\u65bc\u53ef\u4ee5\u8b93\u7db2\u7ad9\u76f4\u63a5\u8b80\u53d6\u53ca\u5f15\u7528\uff0c\u4f7f\u7528\u8005\u53ef\u81ea\u884c\u5b9a\u7fa9\u6a19\u7c64&lt;tags&gt;\u7684\u540d\u7a31\u53ca\u7d50\u69cb\uff0c\u4ee5\u5229\u4f3a\u670d\u5668\u9032\u884c\u8fa8\u8b58\u3002\u4f46\u4e5f\u56e0\u5982\u6b64\u7684\u4fbf\u5229\u6027\uff0c\u82e5\u7db2\u7ad9\u4f3a\u670d\u5668\u6c92\u6709\u91dd\u5c0d\u9019\u4e9b\u81ea\u5b9a\u7fa9\u7684\u5916\u90e8\u5be6\u9ad4\u9032\u884c\u9650\u5236\u7684\u8a71\uff0c\u5c31\u6703\u906d\u53d7\u60e1\u610f\u4f7f\u7528\u8005\u7684\u653b\u64ca\u3002<\/p>\n<p>\u5982\u4e0b\u5716\uff0c\u7576\u4f7f\u7528\u8005\u984d\u5916\u5ba3\u544a\u4e00\u500b\u5be6\u9ad4xxe\uff0c\u4e26\u6307\u5b9a\u6b64\u5916\u90e8\u5be6\u9ad4\u91dd\u5c0d\u4f3a\u670d\u5668\u57f7\u884c\u6307\u4ee4\u300cfile:\/\/\/etc\/passwd\u300d\uff0c\u5373\u53ef\u8f15\u6613\u7372\u5f97\u7db2\u7ad9\u4f3a\u670d\u5668\u7684\u4f7f\u7528\u8005\u5217\u8868\uff0c\u9020\u6210\u9060\u7aef\u5b58\u53d6\u6a5f\u654f\u8cc7\u6599\u7684\u60e1\u610f\u653b\u64ca\u3002<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-301\" src=\"https:\/\/cms.aaasec.com.tw\/wp-content\/uploads\/2019\/03\/4.png\" alt=\"\" width=\"575\" height=\"126\" \/><\/p>\n<p>\u9032\u800c\u900f\u904e$GET[\u2018xml\u2019]\u8f38\u5165\u300chttp:\/\/192.168.156.8\/xml\/example1.php?xml=<span style=\"color: #ff0000;\">&lt;?xml version=&#8221;1.0&#8243; encoding=&#8221;utf-8&#8243;?&gt;&lt;!DOCTYPE name\u00a0 [&lt;!ELEMENT name ANY&gt;&lt;!ENTITY xxe SYSTEM &#8220;file:\/\/\/etc\/passwd&#8221; &gt;]&gt;&lt;root&gt;&lt;name&gt;%26xxe;&lt;\/name&gt;&lt;\/root&gt;<\/span>\u300d\u5f8c\uff0c\u53ef\u76f4\u63a5\u5f9e\u7db2\u7ad9\u7372\u5f97passwd\u6a94\u6848\uff0c\u5982\u4e0b\u5716\u3002<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-302\" src=\"https:\/\/cms.aaasec.com.tw\/wp-content\/uploads\/2019\/03\/5.png\" alt=\"\" width=\"881\" height=\"293\" \/><\/p>\n<p>XXE\u4e0d\u50c5\u53ef\u4ee5\u9020\u6210\u4e0a\u8ff0\u7684\u672c\u5730\u6587\u4ef6\u5305\u542b\u6f0f\u6d1e(Local File Inclusion, LFI)\u98a8\u96aa\uff0c\u900f\u904e\u4fee\u6539payload\u751a\u81f3\u80fd\u57f7\u884c\u9060\u7aef\u7a0b\u5f0f\u78bc\u57f7\u884c(Remote Code Execution, RCE)\u3001\u4f3a\u670d\u5668\u8acb\u6c42\u507d\u9020(Server-Side Request Forgery, SSRF)\u3001\u963b\u65b7\u670d\u52d9\u653b\u64ca(Denial of Service, DoS)\u7b49\u653b\u64ca\u3002\u63a5\u4e0b\u4f86\uff0c\u5c0f\u7de8\u70ba\u5927\u5bb6\u5e36\u4f86XML Injection\u7d93\u5178\u7684\u905e\u8ff4\u5be6\u9ad4\u64f4\u5145\u5957\u4ef6DoS\u653b\u64ca(\u53c8\u7a31Billion Laughs Attack Demo\u6216XML Bomb)\u3002<\/p>\n<p>\u4ee5\u4e0b\u70baBillion Laughs Attack \/ XML Bomb\u7684XML\u793a\u610f\u5716\u3002<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-303\" src=\"https:\/\/cms.aaasec.com.tw\/wp-content\/uploads\/2019\/03\/6.png\" alt=\"\" width=\"1034\" height=\"406\" \/><\/p>\n<p>\u63a5\u8457\u5c07\u9019\u6bb5XML\u6ce8\u5165\u76ee\u6a19\u7db2\u7ad9\u5f8c\uff0c\u6703\u5c0e\u81f4\u76ee\u6a19\u4f3a\u670d\u5668\u7db2\u7ad9\u905e\u8ff4\u8655\u7406\u5916\u90e8\u5be6\u9ad4\u7684\u5f15\u7528\u800c\u9020\u6210DoS\u98a8\u96aa\u3002<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-304\" src=\"https:\/\/cms.aaasec.com.tw\/wp-content\/uploads\/2019\/03\/7.png\" alt=\"\" width=\"885\" height=\"361\" \/><\/p>\n<p>\u6700\u5f8c\uff0c\u96d6\u7136\u666e\u904d\u7db2\u7ad9\u5df2\u7d93\u8d8a\u4f86\u8d8a\u5c11\u4f7f\u7528XML\u683c\u5f0f\u800c\u662f\u5229\u7528JSON\u4f86\u9032\u884c\u8cc7\u6599\u683c\u5f0f\u50b3\u905e\u3002\u4f46\u4ecd\u6709\u4e0d\u5c11\u7684\u7db2\u7ad9\u9084\u662f\u4f7f\u7528XML\u4e5f\u4f9d\u7136\u5b58\u5728XML Injection\u7684\u98a8\u96aa\uff0c\u70ba\u4e86\u907f\u514d\u7db2\u7ad9\u5b58\u5728RCE\u3001SSRF\u3001DoS\u7b49\u98a8\u96aa\u3002\u5efa\u8b70\u7cfb\u7d71\u958b\u767c\u4eba\u54e1\u4ecd\u8981\u91dd\u5c0dXML\u7981\u6b62\u4f7f\u7528\u5916\u90e8\u5be6\u9ad4\uff0c\u9032\u800c\u8b93\u7db2\u7ad9\u4f3a\u670d\u5668\u4e0d\u6703\u8655\u7406\u4f7f\u7528\u8005\u81ea\u884c\u5b9a\u7fa9\u7684XML\u5be6\u9ad4\uff0c\u9810\u9632XXE Injection\u7684\u767c\u751f\u3002<\/p>\n<p>&#8212;<\/p>\n<p>\u53c3\u8003<\/p>\n<p>[1] \u4f86\u81ea\u5916\u90e8\u7684\u5a01\u8105-XXE\u6f0f\u6d1e\u653b\u64ca\u6210\u56e0\u00a0<a href=\"http:\/\/www.digicentre.com.tw\/industry_detail.php?id=38\">http:\/\/www.digicentre.com.tw\/industry_detail.php?id=38<\/a><\/p>\n<p>[2] XXE\u6f0f\u6d1e\u5b78\u7fd2\u5f9e\u5165\u9580\u5230\u653e\u68c4\u00a0<a href=\"https:\/\/www.jianshu.com\/p\/77f2181587a4\">https:\/\/www.jianshu.com\/p\/77f2181587a4<\/a><\/p>\n<p>[3] XML Based Attacks\u00a0<a href=\"https:\/\/www.owasp.org\/images\/5\/58\/XML_Based_Attacks_-_OWASP.pdf\">https:\/\/www.owasp.org\/images\/5\/58\/XML_Based_Attacks_-_OWASP.pdf<\/a><\/p>\n<p>[4] XML external entity attack\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/XML_external_entity_attack\">https:\/\/en.wikipedia.org\/wiki\/XML_external_entity_attack<\/a><\/p>\n<p>[5] Billion laughs attack\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Billion_laughs_attack?fbclid=IwAR2UDCl585ARn-SGI7mHuU1Dq9f_RGXrHxt6XVP-aV6ySHk3Yj5fNwz2Z4Y\">https:\/\/en.wikipedia.org\/wiki\/Billion_laughs_attack?fbclid=IwAR2UDCl585ARn-SGI7mHuU1Dq9f_RGXrHxt6XVP-aV6ySHk3Yj5fNwz2Z4Y<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/posts\/297"}],"collection":[{"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/comments?post=297"}],"version-history":[{"count":1,"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/posts\/297\/revisions"}],"predecessor-version":[{"id":306,"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/posts\/297\/revisions\/306"}],"wp:attachment":[{"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/media?parent=297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/categories?post=297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cms.aaasec.com.tw\/index.php\/wp-json\/wp\/v2\/tags?post=297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}